Investigators with the Minnesota Bureau of Criminal Apprehension and the Marshall County Sheriff's Office believe the injuries happened on Aug. 2 at Marsden's home in Grygla. Rylin Marsden died of his injuries on Aug. 8 at MeritCare Hospital in Fargo, N.D.

Prosecutors with the Minnesota Attorney General's Office are handling the case. Each felony count carries a maximum penalty of 40 years in prison.